#!/usr/bin/env bash

# Copyright 2019 The Kubernetes Authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

set -e
set -u
set -o pipefail

RELEASE_TOOLS=(
  krel
  schedule-builder
  publish-release
  release-notes
)

setup_env() {
  echo "Setting up environment..."

  if [[ -z "${RELEASE_TOOL_BIN:-}" ]]; then
    if [ -n "${GOBIN:-}" ]; then
      export RELEASE_TOOL_BIN="${GOBIN}"
    else
      export RELEASE_TOOL_BIN="${GOPATH}/bin"
    fi
  fi

  export PATH="${PATH}:${RELEASE_TOOL_BIN}"
}

compile() {
  local tool="$1"

  echo "Compiling $tool..."

  go install "${tool}"
  echo "${tool} compiled & installed"
}

compile_with_flags() {
  local pkg
  local tool="$1"

  pkg=sigs.k8s.io/release-utils/version

  go build -v -trimpath -ldflags "-s -w \
    -X $pkg.gitVersion=$(git describe --tags --abbrev=0 || echo unknown)" \
    -o "$RELEASE_TOOL_BIN/$tool" "./cmd/$tool" \
    || return 1

  echo "$tool was successfully compiled and installed to $RELEASE_TOOL_BIN/$tool"
}

main() {
  cd "$(dirname "${BASH_SOURCE[0]}")"

  setup_env

  if [ $# -gt 0 ]; then
    for tool in "$@"; do
      if [[ ${tool} =~ github.com\/ ]]; then
        compile "${tool}"
      else
        compile_with_flags "${tool}"
      fi
    done
  else
    for tool in "${RELEASE_TOOLS[@]}"; do
      echo "Compiling default release tools..."
      compile_with_flags "${tool}"
    done
  fi
}

main "$@"
